基于激光测高数据的丹江口水库水位变化监测

Water level change monitoring of Danjiangkou reservoir based on laser altimetry data

针对多源星载激光测高数据监测湖泊水位变化问题,该文选取2003—2009年ICESat/GLAH14全球地表高程数据、2018年10月—2019年8月的ICESat-2/ATL13全球内陆水体高程数据,提取丹江口水库多期水位变化数据,最后利用水位站实测水位对其准确度进行了验证,并分析了丹江口水库年度水位变化规律。结果表明,丹江口水库水位呈现明显的季节性变化,每年11月达到较高水位,3月降至较低水位;由ICESat/GLAH14数据估算水库水位的精度为16 cm,ICESat-2/ATL13数据集估算水库水位的精度达到10 cm。因此,ICESat-2/ATL13数据用于内陆水体水位变化监测具有很高的可行性。

Aiming at the problem of monitoring lake water level change with multi-source satellite laser altimetry data,ICESat/GLAH14 global land surface altimetry data from 2003 to 2009,ICESat-2/ATL13 global inland water surface height data from October of 2018 to August of 2019 were selected.The dynamic changes of long time series of water level in Danjiangkou reservoir were gained.Then,the accuracy of water level derived from ICESat/GLAH14 and ICESat-2/ATL13 data was verified by comparing with the ground water level data,and the annual water level variation law of Danjiangkou reservoir was analyzed.The results showed that the water level of Danjiangkou reservoir varied seasonally,reaching a higher level in November and falling to a lower level in March.The accuracy of the water level derived from ICESat/GLAH14 data was 16 cm in Danjiangkou reservoir.By contrast,ICESat-2/ATL13 data peformed better and it had an accuracy of 10 cm.Therefore,the ICESat-2/ATL13 data is highly feasible for the detection of water level changes in inland waters.